| Kingdom of England | ||
| 1689: | Henry Herbert’s Regiment of Foot │ |
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| 1689: | Charles Herbert’s │ |
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| 1691: | Toby Purcell’s │ |
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| 1692: | John Morgan’s │ |
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| 1693: | Richard Ingoldsby’s │ |
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| 1702: | The Welsh Regiment of Fuzileers Richard Ingoldby’s │ |
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| 1705: | Jospeh Sabine’s │ |
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| 1707: | Kingdom of Great Britain | |
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| 1712: | The Royal Regiment of Welch Fuzileers Jospeh Sabine’s │ |
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| 1714: | The Prince of Wales’s Own Royal Regiment of Welch Fuzileers Jospeh Sabine’s │ |
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| 1727: | The Royal Welch Fuzileers Jospeh Sabine’s │ |
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| 1739: | Newsham Peers’ │ |
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| 1742: | ranked as 23rd Foot │ |
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| 1743: | John Huske’s │ |
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| 1751: | 23rd Regiment of Foot (Royal Welch Fusiliers) │ |
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| 1756: | 2nd Battalion raised │ |
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| 1758: | 2nd Battalion → 68th Regiment of Foot │ |
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│ │ |
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| 1801: | United Kingdom of Great Britain and Ireland | |
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| 1804: | 2nd Battalion raised │ |
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| 1814: | 2nd Battalion disbanded │ |
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| 1843: | Reserve Battalion raised │ |
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| 1852: | Reserve Battalion disbanded │ |
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| 1857: | 2nd Battalion raised │ |
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| The creation of the territorial regiments by the Childers reforms | ||
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| 1881: | 1st Battalion, 2nd Battalion, | |
The Royal Welsh Fusiliers
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| 1920: | The Royal Welch Fusiliers | |
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| 1922: | United Kingdom of Great Britain and Northern Ireland | |
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| 1948: | 2nd Battalion disbanded │ |
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| 1948: |
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| 1952: | 2nd Battalion raised │ |
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| 1957: | 2nd Battalion disbanded │ |
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| 1958: |  │ |
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| 1968: |
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| 2006: | 1st Battalion, The Royal Welsh (Royal Welch Fusiliers) |
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| 2014: | merged into 1st Battalion, The Royal Welsh |
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